Constant Contact Plugin and Memberships (1 post)

We use Constant Contact for our mailing lists. We are trying to consolidate our forms on a couple of websites - one is a zoo website and one for a daily 1-hour internet tv show broadcast from the zoo.

Zoo website is NOT a WordPress website.
On the zoo website, we use a form for guests to sign up for our electronic newsletter mailing list and our hard copy newsletter mailed out via USPS. This form does not require you to provide a password.

TV website is a WordPress website.
On the tv website which we do our live broadcast from, we do require our users to login requiring both a user name and a password. We have a chat-room on the live broadcast page for them to interact with the tv show hosts.

Can we use one sign-up form for both sites to consolidate the two databases using the Constant Contact plugin? Tricky part is one requires a password and user name and the other just a name and address. We want to collect name, address, email mainly. But the tv site will require additional credentials.

Thanks in advance for any directions and/or instructions to achieve this?